PBuffer.cpp
上传用户:ghyvgy
上传日期:2009-05-26
资源大小:547k
文件大小:5k
- /*
- s_p_oneil@hotmail.com
- Copyright (c) 2000, Sean O'Neil
- All rights reserved.
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions are met:
- * Redistributions of source code must retain the above copyright notice,
- this list of conditions and the following disclaimer.
- * Redistributions in binary form must reproduce the above copyright notice,
- this list of conditions and the following disclaimer in the documentation
- and/or other materials provided with the distribution.
- * Neither the name of this project nor the names of its contributors
- may be used to endorse or promote products derived from this software
- without specific prior written permission.
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- POSSIBILITY OF SUCH DAMAGE.
- */
- #include "Master.h"
- #include "PBuffer.h"
- bool CPBuffer::Init(int nWidth, int nHeight, int nFlags)
- {
- Cleanup();
- m_nFlags = nFlags;
- // Temporarily store the current device and rendering contexts
- HDC hDC = wglGetCurrentDC();
- HGLRC hGLRC = wglGetCurrentContext();
- // Set up floating point attributes for pbuffer
- int i;
- float fAttributes[2*MAX_ATTRIBS];
- for(i=0; i<2*MAX_ATTRIBS; i++)
- fAttributes[i] = 0;
- // Set up integer point attributes for pbuffer
- int iAttributes[2*MAX_ATTRIBS];
- for(i=0; i<2*MAX_ATTRIBS; i++)
- iAttributes[i] = 0;
- i=0;
- iAttributes[i++] = WGL_DRAW_TO_PBUFFER_ARB;
- iAttributes[i++] = true;
- iAttributes[i++] = WGL_PIXEL_TYPE_ARB;
- iAttributes[i++] = WGL_TYPE_RGBA_ARB;
- if(nFlags & DepthBuffer)
- {
- iAttributes[i++] = WGL_DEPTH_BITS_ARB;
- iAttributes[i++] = 1;
- }
- if(nFlags & StencilBuffer)
- {
- iAttributes[i++] = WGL_STENCIL_BITS_ARB;
- iAttributes[i++] = 1;
- }
- iAttributes[i++] = WGL_SUPPORT_OPENGL_ARB;
- iAttributes[i++] = true;
- int pFormat[MAX_PFORMATS];
- unsigned int nFormats;
- if(wglChoosePixelFormatARB(hDC, iAttributes, fAttributes, MAX_PFORMATS, pFormat, &nFormats) && nFormats > 0)
- {
- #ifdef _DEBUG
- int nAttributes[MAX_ATTRIBS] = {WGL_PIXEL_TYPE_ARB, WGL_COLOR_BITS_ARB, WGL_RED_BITS_ARB, WGL_GREEN_BITS_ARB, WGL_BLUE_BITS_ARB, WGL_ALPHA_BITS_ARB, WGL_DEPTH_BITS_ARB, WGL_STENCIL_BITS_ARB, WGL_ACCUM_BITS_ARB, WGL_DOUBLE_BUFFER_ARB, WGL_SUPPORT_OPENGL_ARB, WGL_ACCELERATION_ARB};
- int nValues[MAX_ATTRIBS] = {false, false, false, false, false, false, false, false, false, false, false, false};
- wglGetPixelFormatAttribivARB(hDC, pFormat[0], 0, 12, nAttributes, nValues);
- TRACE("PixelFormat %d:", pFormat[0]);
- for(i=0; i<12; i++)
- {
- if(nAttributes[i] == WGL_COLOR_BITS_ARB)
- TRACE(" Color bits = %d", nValues[i]);
- if(nAttributes[i] == WGL_RED_BITS_ARB)
- TRACE(" red %d", nValues[i]);
- if(nAttributes[i] == WGL_GREEN_BITS_ARB)
- TRACE(" green %d", nValues[i]);
- if(nAttributes[i] == WGL_BLUE_BITS_ARB)
- TRACE(" blue %d", nValues[i]);
- if(nAttributes[i] == WGL_ALPHA_BITS_ARB)
- TRACE(" alpha %d", nValues[i]);
- if(nAttributes[i] == WGL_DEPTH_BITS_ARB)
- TRACE(" Depth bits = %d", nValues[i]);
- if(nAttributes[i] == WGL_STENCIL_BITS_ARB)
- TRACE(" Stencil bits = %d", nValues[i]);
- if(nAttributes[i] == WGL_ACCELERATION_ARB)
- TRACE(" Acceleration = %s", nValues[i] == WGL_FULL_ACCELERATION_ARB ? "full" : "???");
- }
- TRACE("");
- #endif
- iAttributes[0] = 0;
- m_hBuffer = wglCreatePbufferARB(hDC, pFormat[0], nWidth, nHeight, iAttributes);
- m_hDC = wglGetPbufferDCARB(m_hBuffer);
- m_hGLRC = wglCreateContext(m_hDC);
- wglQueryPbufferARB(m_hBuffer, WGL_PBUFFER_WIDTH_ARB, &m_nWidth);
- wglQueryPbufferARB(m_hBuffer, WGL_PBUFFER_HEIGHT_ARB, &m_nHeight);
- wglShareLists(hGLRC, m_hGLRC);
- return true;
- }
- return false;
- }
- void CPBuffer::Cleanup()
- {
- if(m_hBuffer)
- {
- wglDeleteContext(m_hGLRC);
- wglReleasePbufferDCARB(m_hBuffer, m_hDC);
- wglDestroyPbufferARB(m_hBuffer);
- m_hBuffer = NULL;
- }
- }
- void CPBuffer::HandleModeSwitch()
- {
- if(m_hBuffer)
- {
- int nLost = 0;
- wglQueryPbufferARB(m_hBuffer, WGL_PBUFFER_LOST_ARB, &nLost);
- if(nLost)
- {
- Cleanup();
- Init(m_nWidth, m_nHeight);
- }
- }
- }